Commit | Line | Data |
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0e149233 AN |
1 | /* |
2 | * TX4939 internal RTC driver | |
3 | * Based on RBTX49xx patch from CELF patch archive. | |
4 | * | |
5 | * This file is subject to the terms and conditions of the GNU General Public | |
6 | * License. See the file "COPYING" in the main directory of this archive | |
7 | * for more details. | |
8 | * | |
9 | * (C) Copyright TOSHIBA CORPORATION 2005-2007 | |
10 | */ | |
11 | #include <linux/rtc.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/io.h> | |
15 | #include <asm/txx9/tx4939.h> | |
16 | ||
17 | struct tx4939rtc_plat_data { | |
18 | struct rtc_device *rtc; | |
19 | struct tx4939_rtc_reg __iomem *rtcreg; | |
20 | }; | |
21 | ||
22 | static struct tx4939rtc_plat_data *get_tx4939rtc_plat_data(struct device *dev) | |
23 | { | |
24 | return platform_get_drvdata(to_platform_device(dev)); | |
25 | } | |
26 | ||
27 | static int tx4939_rtc_cmd(struct tx4939_rtc_reg __iomem *rtcreg, int cmd) | |
28 | { | |
29 | int i = 0; | |
30 | ||
31 | __raw_writel(cmd, &rtcreg->ctl); | |
32 | /* This might take 30us (next 32.768KHz clock) */ | |
33 | while (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_BUSY) { | |
34 | /* timeout on approx. 100us (@ GBUS200MHz) */ | |
35 | if (i++ > 200 * 100) | |
36 | return -EBUSY; | |
37 | cpu_relax(); | |
38 | } | |
39 | return 0; | |
40 | } | |
41 | ||
42 | static int tx4939_rtc_set_mmss(struct device *dev, unsigned long secs) | |
43 | { | |
44 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); | |
45 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; | |
46 | int i, ret; | |
47 | unsigned char buf[6]; | |
48 | ||
49 | buf[0] = 0; | |
50 | buf[1] = 0; | |
51 | buf[2] = secs; | |
52 | buf[3] = secs >> 8; | |
53 | buf[4] = secs >> 16; | |
54 | buf[5] = secs >> 24; | |
55 | spin_lock_irq(&pdata->rtc->irq_lock); | |
56 | __raw_writel(0, &rtcreg->adr); | |
57 | for (i = 0; i < 6; i++) | |
58 | __raw_writel(buf[i], &rtcreg->dat); | |
59 | ret = tx4939_rtc_cmd(rtcreg, | |
60 | TX4939_RTCCTL_COMMAND_SETTIME | | |
61 | (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME)); | |
62 | spin_unlock_irq(&pdata->rtc->irq_lock); | |
63 | return ret; | |
64 | } | |
65 | ||
66 | static int tx4939_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
67 | { | |
68 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); | |
69 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; | |
70 | int i, ret; | |
71 | unsigned long sec; | |
72 | unsigned char buf[6]; | |
73 | ||
74 | spin_lock_irq(&pdata->rtc->irq_lock); | |
75 | ret = tx4939_rtc_cmd(rtcreg, | |
76 | TX4939_RTCCTL_COMMAND_GETTIME | | |
77 | (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME)); | |
78 | if (ret) { | |
79 | spin_unlock_irq(&pdata->rtc->irq_lock); | |
80 | return ret; | |
81 | } | |
82 | __raw_writel(2, &rtcreg->adr); | |
83 | for (i = 2; i < 6; i++) | |
84 | buf[i] = __raw_readl(&rtcreg->dat); | |
85 | spin_unlock_irq(&pdata->rtc->irq_lock); | |
86 | sec = (buf[5] << 24) | (buf[4] << 16) | (buf[3] << 8) | buf[2]; | |
87 | rtc_time_to_tm(sec, tm); | |
88 | return rtc_valid_tm(tm); | |
89 | } | |
90 | ||
91 | static int tx4939_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
92 | { | |
93 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); | |
94 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; | |
95 | int i, ret; | |
96 | unsigned long sec; | |
97 | unsigned char buf[6]; | |
98 | ||
99 | if (alrm->time.tm_sec < 0 || | |
100 | alrm->time.tm_min < 0 || | |
101 | alrm->time.tm_hour < 0 || | |
102 | alrm->time.tm_mday < 0 || | |
103 | alrm->time.tm_mon < 0 || | |
104 | alrm->time.tm_year < 0) | |
105 | return -EINVAL; | |
106 | rtc_tm_to_time(&alrm->time, &sec); | |
107 | buf[0] = 0; | |
108 | buf[1] = 0; | |
109 | buf[2] = sec; | |
110 | buf[3] = sec >> 8; | |
111 | buf[4] = sec >> 16; | |
112 | buf[5] = sec >> 24; | |
113 | spin_lock_irq(&pdata->rtc->irq_lock); | |
114 | __raw_writel(0, &rtcreg->adr); | |
115 | for (i = 0; i < 6; i++) | |
116 | __raw_writel(buf[i], &rtcreg->dat); | |
117 | ret = tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_SETALARM | | |
118 | (alrm->enabled ? TX4939_RTCCTL_ALME : 0)); | |
119 | spin_unlock_irq(&pdata->rtc->irq_lock); | |
120 | return ret; | |
121 | } | |
122 | ||
123 | static int tx4939_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
124 | { | |
125 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); | |
126 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; | |
127 | int i, ret; | |
128 | unsigned long sec; | |
129 | unsigned char buf[6]; | |
130 | u32 ctl; | |
131 | ||
132 | spin_lock_irq(&pdata->rtc->irq_lock); | |
133 | ret = tx4939_rtc_cmd(rtcreg, | |
134 | TX4939_RTCCTL_COMMAND_GETALARM | | |
135 | (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME)); | |
136 | if (ret) { | |
137 | spin_unlock_irq(&pdata->rtc->irq_lock); | |
138 | return ret; | |
139 | } | |
140 | __raw_writel(2, &rtcreg->adr); | |
141 | for (i = 2; i < 6; i++) | |
142 | buf[i] = __raw_readl(&rtcreg->dat); | |
143 | ctl = __raw_readl(&rtcreg->ctl); | |
144 | alrm->enabled = (ctl & TX4939_RTCCTL_ALME) ? 1 : 0; | |
145 | alrm->pending = (ctl & TX4939_RTCCTL_ALMD) ? 1 : 0; | |
146 | spin_unlock_irq(&pdata->rtc->irq_lock); | |
147 | sec = (buf[5] << 24) | (buf[4] << 16) | (buf[3] << 8) | buf[2]; | |
148 | rtc_time_to_tm(sec, &alrm->time); | |
149 | return rtc_valid_tm(&alrm->time); | |
150 | } | |
151 | ||
152 | static int tx4939_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
153 | { | |
154 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); | |
155 | ||
156 | spin_lock_irq(&pdata->rtc->irq_lock); | |
157 | tx4939_rtc_cmd(pdata->rtcreg, | |
158 | TX4939_RTCCTL_COMMAND_NOP | | |
159 | (enabled ? TX4939_RTCCTL_ALME : 0)); | |
160 | spin_unlock_irq(&pdata->rtc->irq_lock); | |
161 | return 0; | |
162 | } | |
163 | ||
164 | static irqreturn_t tx4939_rtc_interrupt(int irq, void *dev_id) | |
165 | { | |
166 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev_id); | |
167 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; | |
168 | unsigned long events = RTC_IRQF; | |
169 | ||
170 | spin_lock(&pdata->rtc->irq_lock); | |
171 | if (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALMD) { | |
172 | events |= RTC_AF; | |
173 | tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_NOP); | |
174 | } | |
175 | spin_unlock(&pdata->rtc->irq_lock); | |
176 | rtc_update_irq(pdata->rtc, 1, events); | |
177 | return IRQ_HANDLED; | |
178 | } | |
179 | ||
180 | static const struct rtc_class_ops tx4939_rtc_ops = { | |
181 | .read_time = tx4939_rtc_read_time, | |
182 | .read_alarm = tx4939_rtc_read_alarm, | |
183 | .set_alarm = tx4939_rtc_set_alarm, | |
184 | .set_mmss = tx4939_rtc_set_mmss, | |
185 | .alarm_irq_enable = tx4939_rtc_alarm_irq_enable, | |
186 | }; | |
187 | ||
188 | static ssize_t tx4939_rtc_nvram_read(struct kobject *kobj, | |
189 | struct bin_attribute *bin_attr, | |
190 | char *buf, loff_t pos, size_t size) | |
191 | { | |
192 | struct device *dev = container_of(kobj, struct device, kobj); | |
193 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); | |
194 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; | |
195 | ssize_t count; | |
196 | ||
197 | spin_lock_irq(&pdata->rtc->irq_lock); | |
198 | for (count = 0; size > 0 && pos < TX4939_RTC_REG_RAMSIZE; | |
199 | count++, size--) { | |
200 | __raw_writel(pos++, &rtcreg->adr); | |
201 | *buf++ = __raw_readl(&rtcreg->dat); | |
202 | } | |
203 | spin_unlock_irq(&pdata->rtc->irq_lock); | |
204 | return count; | |
205 | } | |
206 | ||
207 | static ssize_t tx4939_rtc_nvram_write(struct kobject *kobj, | |
208 | struct bin_attribute *bin_attr, | |
209 | char *buf, loff_t pos, size_t size) | |
210 | { | |
211 | struct device *dev = container_of(kobj, struct device, kobj); | |
212 | struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev); | |
213 | struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg; | |
214 | ssize_t count; | |
215 | ||
216 | spin_lock_irq(&pdata->rtc->irq_lock); | |
217 | for (count = 0; size > 0 && pos < TX4939_RTC_REG_RAMSIZE; | |
218 | count++, size--) { | |
219 | __raw_writel(pos++, &rtcreg->adr); | |
220 | __raw_writel(*buf++, &rtcreg->dat); | |
221 | } | |
222 | spin_unlock_irq(&pdata->rtc->irq_lock); | |
223 | return count; | |
224 | } | |
225 | ||
226 | static struct bin_attribute tx4939_rtc_nvram_attr = { | |
227 | .attr = { | |
228 | .name = "nvram", | |
229 | .mode = S_IRUGO | S_IWUSR, | |
230 | }, | |
231 | .size = TX4939_RTC_REG_RAMSIZE, | |
232 | .read = tx4939_rtc_nvram_read, | |
233 | .write = tx4939_rtc_nvram_write, | |
234 | }; | |
235 | ||
236 | static int __init tx4939_rtc_probe(struct platform_device *pdev) | |
237 | { | |
238 | struct rtc_device *rtc; | |
239 | struct tx4939rtc_plat_data *pdata; | |
240 | struct resource *res; | |
241 | int irq, ret; | |
242 | ||
243 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
244 | if (!res) | |
245 | return -ENODEV; | |
246 | irq = platform_get_irq(pdev, 0); | |
247 | if (irq < 0) | |
248 | return -ENODEV; | |
249 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
250 | if (!pdata) | |
251 | return -ENOMEM; | |
252 | platform_set_drvdata(pdev, pdata); | |
253 | ||
254 | if (!devm_request_mem_region(&pdev->dev, res->start, | |
255 | resource_size(res), pdev->name)) | |
256 | return -EBUSY; | |
257 | pdata->rtcreg = devm_ioremap(&pdev->dev, res->start, | |
258 | resource_size(res)); | |
259 | if (!pdata->rtcreg) | |
260 | return -EBUSY; | |
261 | ||
262 | tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP); | |
263 | if (devm_request_irq(&pdev->dev, irq, tx4939_rtc_interrupt, | |
0a817f7f | 264 | IRQF_DISABLED, pdev->name, &pdev->dev) < 0) |
0e149233 | 265 | return -EBUSY; |
0e149233 AN |
266 | rtc = rtc_device_register(pdev->name, &pdev->dev, |
267 | &tx4939_rtc_ops, THIS_MODULE); | |
268 | if (IS_ERR(rtc)) | |
269 | return PTR_ERR(rtc); | |
270 | pdata->rtc = rtc; | |
271 | ret = sysfs_create_bin_file(&pdev->dev.kobj, &tx4939_rtc_nvram_attr); | |
272 | if (ret) | |
273 | rtc_device_unregister(rtc); | |
274 | return ret; | |
275 | } | |
276 | ||
277 | static int __exit tx4939_rtc_remove(struct platform_device *pdev) | |
278 | { | |
279 | struct tx4939rtc_plat_data *pdata = platform_get_drvdata(pdev); | |
280 | struct rtc_device *rtc = pdata->rtc; | |
281 | ||
282 | spin_lock_irq(&rtc->irq_lock); | |
283 | tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP); | |
284 | spin_unlock_irq(&rtc->irq_lock); | |
285 | sysfs_remove_bin_file(&pdev->dev.kobj, &tx4939_rtc_nvram_attr); | |
286 | rtc_device_unregister(rtc); | |
287 | platform_set_drvdata(pdev, NULL); | |
288 | return 0; | |
289 | } | |
290 | ||
291 | static struct platform_driver tx4939_rtc_driver = { | |
292 | .remove = __exit_p(tx4939_rtc_remove), | |
293 | .driver = { | |
294 | .name = "tx4939rtc", | |
295 | .owner = THIS_MODULE, | |
296 | }, | |
297 | }; | |
298 | ||
299 | static int __init tx4939rtc_init(void) | |
300 | { | |
301 | return platform_driver_probe(&tx4939_rtc_driver, tx4939_rtc_probe); | |
302 | } | |
303 | ||
304 | static void __exit tx4939rtc_exit(void) | |
305 | { | |
306 | platform_driver_unregister(&tx4939_rtc_driver); | |
307 | } | |
308 | ||
309 | module_init(tx4939rtc_init); | |
310 | module_exit(tx4939rtc_exit); | |
311 | ||
312 | MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>"); | |
313 | MODULE_DESCRIPTION("TX4939 internal RTC driver"); | |
314 | MODULE_LICENSE("GPL"); | |
315 | MODULE_ALIAS("platform:tx4939rtc"); |